Crawler wheel side rubber composition, crawler wheel side rubber and application thereof

Abstract

The invention provides a crawler wheel side rubber composition, crawler wheel side rubber and application thereof, and particularly relates to the technical field of tire manufacturing. The crawler wheel side rubber composition is prepared from the following components in parts by weight: 15 to 55 parts of natural rubber, 45 to 85 parts of chloroprene rubber, 12 to 32 parts of carbon black, 7 to 16 parts of white carbon black, 30 to 65 parts of a flame retardant, 5 to 10 parts of an activating agent, 0.5 to 1.5 parts of an activating auxiliary agent, 1 to 3 parts of an anti-aging agent, 1 to 4 parts of a vulcanizing agent and 2.5 to 4.5 parts of an accelerant, the flame retardant comprises antimony trioxide. According to the crawler wheel side rubber composition provided by the invention, through the synergistic effect of the raw materials, the maintenance of physical properties is ensured while the flame retardant property is improved, and dual optimization of the flame retardant property and the physical properties is realized. Meanwhile, the invention provides a mixing method of the crawler wheel side rubber, and the problem that high-part white carbon black is not easy to disperse is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing, and in particular to a track wheel side rubber composition, a track wheel side rubber and applications thereof. Background Art

[0002] Wheel side rubber is an important component of track components. It needs to have the characteristics of tear resistance, resistance to oxygen and ozone in the air, resistance to sunlight aging, resistance to flex cracking, resistance to crack growth, resistance to compression permanent deformation and resistance to dynamic fatigue. However, as an organic flammable material, rubber has safety risks. Therefore, in addition to good physical properties, rubber tracks should also have good flame retardant properties.

[0003] With the development of the track industry, the performance requirements for tracks are getting higher and higher, among which flame retardant properties are particularly important. The traditional track wheel side formula is mainly made of natural rubber, carbon black, microcrystalline wax and other materials. These materials will release a large amount of toxic gases when burned, posing a serious threat to the environment and human health. Therefore, improving the flame retardant properties of the track wheel side has become an important task at present. Although existing solutions can improve the flame retardant properties of tracks to a certain extent, there are still some problems. First, the use of these flame retardants may have a negative impact on other properties of the track, such as wear resistance and aging resistance. Secondly, conventional flame retardant formulas often use white carbon black instead of carbon black. This high white carbon black system has the problem of being difficult to disperse, which in turn affects the mixing process.

[0004] Therefore, how to improve the flame retardant performance of crawlers while avoiding the impact on other properties, reducing production costs and reducing environmental pollution is the main problem facing current technology.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] One of the purposes of the present invention is to provide a track wheel side rubber composition to alleviate at least one of the above technical problems in the prior art.

[0007] A second object of the present invention is to provide a track wheel side rubber.

[0008] A third object of the present invention is to provide an application of the track wheel side rubber.

[0009] In order to solve the above-mentioned technical problems, the present invention particularly adopts the following technical solutions: The first aspect of the present invention provides a track wheel side rubber composition, which comprises, by weight: 15 to 55 parts of natural rubber, 45 to 85 parts of chloroprene rubber, 12 to 32 parts of carbon black, 7 to 16 parts of white carbon black, 30 to 65 parts of flame retardant, 5 to 10 parts of activator, 0.5 to 1.5 parts of activation aid, 1 to 3 parts of antioxidant, 1 to 4 parts of vulcanizer and 2.5 to 4.5 parts of accelerator; the flame retardant comprises antimony trioxide.

[0010] Furthermore, the flame retardant includes tricresyl phosphate and / or chlorinated paraffin.

[0011] Furthermore, the activator includes magnesium oxide and / or zinc oxide; and the activation aid includes stearic acid.

[0012] Furthermore, the brand of the antioxidant includes at least one of antioxidant 4020, antioxidant RD and antioxidant 4010NA.

[0013] The vulcanizing agent includes sulfur.

[0014] The brand of the accelerator includes at least one of NA-22, DM and CZ. The addition amount of the accelerator NA-22 is 0.5 to 1.5 parts.

[0015] Furthermore, the grade of the carbon black includes at least one of N220, N234, N330, N326 and N375, preferably N330, N326, N234, and more preferably N234.

[0016] The white carbon black includes vapor deposition white carbon black or precipitation white carbon black.

[0017] The white carbon black has a silicon dioxide content of ≥99.8%, an average particle size of 8-19 nm, a specific surface area of ​​130-400 m² / g, a DBP oil absorption value of 1.5-2 cm³ / g, a relative density of 2.00-2.30 g / cm³, a pH value of 3.9-4.0, and a moisture content of 1.0-1.5%.

[0018] Furthermore, the track wheel side rubber composition comprises, by weight: 15-55 parts of natural rubber, 45-85 parts of chloroprene rubber, 12-32 parts of carbon black, 7-16 parts of white carbon black, 30-60 parts of antimony trioxide, 2-5 parts of chlorinated paraffin, 2-4 parts of magnesium oxide, 3-6 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur and 2.5-4.5 parts of accelerator.

[0019] The second aspect of the present invention provides a track wheel side rubber, which is mainly obtained by mixing the track wheel side rubber composition.

[0020] Further, the mixing comprises the following steps: A. Mix white carbon black and antimony trioxide and disperse them uniformly to obtain a suspension; then mix the suspension with natural rubber to obtain a first masterbatch.

[0021] B. Mix the other raw materials except the vulcanizer and the accelerator, and perform two-stage mixing to obtain the second masterbatch.

[0022] C. Adding the first masterbatch to the second masterbatch and performing three-stage mixing and four-stage mixing to obtain a third masterbatch.

[0023] D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track wheel side rubber.

[0024] The one-stage mixing process is: mixing the suspension and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber.

[0025] Furthermore, the two-stage mixing includes mixing for 20-60 seconds, mixing with the plug lifted and pressed for 20-35 seconds, and then mixing with the plug lifted and pressed to 150-165° C. for debonding in this order.

[0026] The three-stage mixing includes mixing for 15-50s, mixing for 15-30s with the bolt lifted and the bolt pressed, and then mixing to 140-150°C for debonding with the bolt lifted and the bolt pressed.

[0027] The four-stage mixing includes mixing for 15-60 seconds, mixing with the plug lifted and the plug pressed for 20-40 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135-145° C. for debonding.

[0028] The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

[0029] The third aspect of the present invention provides the use of the track wheel side rubber in the preparation of fire truck tires, hazardous chemicals transport vehicle tires or coal mine underground transport vehicle tires.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects: The track wheel side rubber composition provided by the present invention improves the flame retardancy by partially replacing natural rubber with chloroprene rubber. Chloroprene rubber exhibits excellent flame retardant properties due to the chlorine atoms in its molecular structure, which can effectively curb the combustion process. In addition, antimony trioxide, as a flame retardant, reacts with the chlorine element in chloroprene rubber to generate antimony chlorides, which form a covering layer on the surface of the rubber material, effectively isolating oxygen, and further enhancing the flame retardant effect of the material. In terms of mechanical properties, the addition of white carbon black significantly improves the strength and toughness of the composition. At the same time, antimony trioxide not only acts as a flame retardant, but also improves the dispersibility of white carbon black in the rubber material, allowing the addition amount of white carbon black to be increased, thereby further improving the mechanical properties of the composition. Through this synergistic effect, the track wheel side rubber composition of the present invention not only improves the flame retardancy, but also ensures the maintenance of physical properties, achieving dual optimization of flame retardancy and physical properties.

[0031] The track wheel side rubber provided by the present invention, in view of the advantages of the above-mentioned track wheel side rubber composition, makes the prepared track wheel side rubber have better flame retardancy, wear resistance, aging resistance and tear resistance, is suitable for various harsh working environments, expands the application fields of track wheel side rubber, and promotes the development of related industries.

[0032] The application of the track wheel side rubber provided by the present invention provides better raw materials for preparing fire truck tires, hazardous chemical transport vehicle tires or coal mine underground transport vehicle tires. It releases less toxic gas during combustion, making it an ideal choice in modern society with increasing environmental awareness, and meets the modern tire industry's needs for high performance, high safety and environmental protection. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in combination with the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, but not all of the embodiments. The components of the embodiment of the present invention can be arranged and designed in various different configurations.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] The first aspect of the present invention provides a track wheel side rubber composition, which comprises, by weight: 15 to 55 parts of natural rubber, 45 to 85 parts of chloroprene rubber, 12 to 32 parts of carbon black, 7 to 16 parts of white carbon black, 30 to 65 parts of flame retardant, 5 to 10 parts of activator, 0.5 to 1.5 parts of activation aid, 1 to 3 parts of antioxidant, 1 to 4 parts of vulcanizer and 2.5 to 4.5 parts of accelerator; the flame retardant comprises antimony trioxide.

[0036] The track wheel side rubber composition provided by the present invention improves the flame retardancy by partially replacing natural rubber with chloroprene rubber. Chloroprene rubber exhibits excellent flame retardant properties due to the chlorine atoms in its molecular structure, which can effectively curb the combustion process. In addition, antimony trioxide, as a flame retardant, reacts with the chlorine element in chloroprene rubber to generate antimony chlorides, which form a covering layer on the surface of the rubber material, effectively isolating oxygen, and further enhancing the flame retardant effect of the material. In terms of mechanical properties, the addition of white carbon black significantly improves the strength and toughness of the composition. At the same time, antimony trioxide not only acts as a flame retardant, but also improves the dispersibility of white carbon black in the rubber material, allowing the addition amount of white carbon black to be increased, thereby further improving the mechanical properties of the composition. Through this synergistic effect, the track wheel side rubber composition of the present invention not only improves the flame retardancy, but also ensures the maintenance of physical properties, achieving dual optimization of flame retardancy and physical properties.

[0037] It should be noted that the total amount of natural rubber and chloroprene rubber as base rubber is 100 parts. In the track wheel side rubber composition, the use of natural rubber and chloroprene rubber as base rubber can significantly improve the mechanical properties and flame retardant properties of the material. Natural rubber has excellent elasticity and tensile strength, which makes it show good toughness and wear resistance when subjected to mechanical stress. However, the aging resistance and flame retardant properties of natural rubber are poor. Chloroprene rubber has good heat aging resistance, ozone aging resistance and flame retardant properties. The chlorine atoms in its molecular structure will generate hydrogen chloride gas during the combustion process, which plays a gas phase flame retardant role. By blending natural rubber and chloroprene rubber, the advantages of both can be combined to make up for their respective shortcomings. The addition of chloroprene rubber can improve the aging resistance and flame retardant properties of the blended material, while natural rubber improves the processing properties of chloroprene rubber. This combination enables the track wheel side rubber to have excellent flame retardant properties while maintaining good mechanical properties, meeting the needs of modern industry for high-performance rubber materials.

[0038] Chloroprene is a synthetic rubber with excellent flame retardancy. Its molecular structure contains chlorine atoms, which can effectively prevent the spread of combustion. By adjusting the proportion of chloroprene rubber, the purpose of improving flame retardancy can be achieved while avoiding negative impact on other properties.

[0039] The proportions of the composition can have many specific examples, but are not limited to the following examples: the content of natural rubber can be 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or 55 parts, or any value within the range of 15 to 55 parts; the content of chloroprene rubber can be 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts or 85 parts, or any value within the range of 45 to 85 parts; the content of carbon black can be 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts or 32 parts, or any value within the range of 12 to 32 parts; the content of white carbon black can be 7 parts, 9 parts, 11 parts, 13 parts, 15 parts or 16 parts, or any value within the range of 7 to 16 parts; the content of flame retardant can be 30 parts, 35 parts, 40 parts, 45 parts, The content of the activator can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, or any value in the range of 5 parts to 10 parts; the content of the activation aid can be 0.5 parts, 0.7 parts, 0.9 parts, 1.1 parts, 1.3 parts or 1.5 parts, or any value in the range of 0.5 parts to 1.5 parts; the content of the antioxidant can be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, or any value in the range of 1 part to 3 parts; the content of the vulcanizing agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, or any value in the range of 1 part to 4 parts; the content of the accelerator can be 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, or any value in the range of 2.5 parts to 4.5 parts.

[0040] Furthermore, the flame retardant further comprises tricresyl phosphate and / or chlorinated paraffin.

[0041] Add appropriate amounts of antimony trioxide and chlorinated paraffin to the rubber formula. Antimony trioxide is a highly effective flame retardant that can promote the carbonization of rubber and form a carbon layer that isolates the air, thereby preventing combustion. Chlorinated paraffin is an organic flame retardant that can cool and isolate oxygen, thereby reducing the possibility of combustion. By precisely controlling the amount of these two flame retardants added, the purpose of both improving flame retardancy and reducing environmental pollution can be achieved. Antimony trioxide and chlorinated paraffin as a flame retardant combination have significant contributions in track wheel side rubber. First, antimony trioxide will melt during the combustion process and form a protective film on the surface of the material, isolating the air and reducing the combustion temperature. At the same time, it forms an antimony-halogen system with chlorinated paraffin. Chlorinated paraffin releases hydrogen chloride gas when heated, which reacts with antimony trioxide to form antimony trichloride (SbCl3). This compound will further decompose at high temperature to generate antimony chloride vapor. These vapors have a high specific gravity and can cover the rubber surface, isolating the air, and at the same time capture active free radicals in the flame in the gas phase, thereby inhibiting combustion. In addition, this combination has a synergistic effect that can improve the overall flame retardant effect.

[0042] Furthermore, the activator includes magnesium oxide and / or zinc oxide; and the activation aid includes stearic acid.

[0043] Furthermore, the brand of the antioxidant includes at least one of antioxidant 4020, antioxidant RD and antioxidant 4010NA, and antioxidant 4020 is preferred.

[0044] The vulcanizing agent includes sulfur.

[0045] The brand of the accelerator includes at least one of NA-22, DM and CZ. The addition amount of the accelerator NA-22 is 0.5 to 1.5 parts.

[0046] Accelerator NA-22 has a highly efficient vulcanization activity, which can achieve the cross-linking reaction of rubber in a relatively short time, thereby improving the physical properties and durability of rubber. Secondly, it can provide good tensile strength and low compression deformation during the vulcanization process, which is very important for improving the durability and stability of rubber products. In addition, accelerator NA-22 is safe to operate during use and is not easy to scorch, which makes it more reliable in the production process. It also has good dispersibility and will not contaminate rubber products or affect the color of the product. These characteristics make accelerator NA-22 particularly suitable for the combination of chloroprene rubber and natural rubber.

[0047] There are many specific examples of the amount of accelerator NA-22 added, but it is not limited to the following examples: the amount added can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts or 1.5 parts, or any value within the range of 0.5 parts to 1.5 parts.

[0048] Furthermore, the grade of the carbon black includes at least one of N220, N234, N330, N326 and N375, preferably N330, N326, N234, and more preferably N234.

[0049] The white carbon black includes vapor deposition white carbon black and precipitation white carbon black.

[0050] The white carbon black has a silicon dioxide content of ≥99.8%, an average particle size of 8-19 nm, a specific surface area of ​​130-400 m² / g, a DBP oil absorption value of 1.5-2 cm³ / g, a relative density of 2.00-2.30 g / cm³, a pH value of 3.9-4.0, and a moisture content of 1.0-1.5%.

[0051] Furthermore, the track wheel side rubber composition comprises, by weight: 15-55 parts of natural rubber, 45-85 parts of chloroprene rubber, 12-32 parts of carbon black, 7-16 parts of white carbon black, 30-60 parts of antimony trioxide, 2-5 parts of chlorinated paraffin, 2-4 parts of magnesium oxide, 3-6 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur and 2.5-4.5 parts of accelerator.

[0052] The flame retardant is a combination of antimony trioxide and chlorinated paraffin, which will have a certain impact on the mechanical properties of rubber. The softening effect of chlorinated paraffin may cause the tensile strength and elongation of rubber to decrease, while the hardness increases. Therefore, when using chlorinated paraffin, the addition amount is controlled at 2~5 parts to balance the relationship between flame retardancy and mechanical properties.

[0053] There are many specific examples of the proportion of the components of the composition, but are not limited to the following examples: the content of natural rubber can be 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, or any value within the range of 15 to 55 parts; the content of chloroprene rubber can be 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, or any value within the range of 45 to 85 parts; the content of carbon black can be 12 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, or any value within the range of 15 to 55 parts; The content of white carbon black can be 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 16 parts, or any value within the range of 7 parts to 16 parts; the content of antimony trioxide can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, or any value within the range of 30 parts to 60 parts; the content of chlorinated paraffin can be 2 parts, 2.5 parts, 3 The content of magnesium oxide can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, or any value within the range of 2 parts to 4 parts; the content of zinc oxide can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, or any value within the range of 3 parts to 6 parts; the content of stearic acid can be 0.5 parts, 0.7 parts, 0.9 parts, 1.0 parts, 1.2 parts, 1.4 parts, 1.5 parts, or any value within the range of 3 parts to 6 parts; The content of antioxidant 4020 can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, or any value in the range of 1 part to 3 parts; the content of sulfur can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, or any value in the range of 1 part to 4 parts; the content of accelerator can be 2.5 parts, 3 parts, 3.5 parts, 4 parts, or any value in the range of 2.5 parts to 4.5 parts.

[0054] The second aspect of the present invention provides a track wheel side rubber, which is mainly obtained by mixing the track wheel side rubber composition.

[0055] The track wheel side rubber provided by the present invention, in view of the advantages of the above-mentioned track wheel side rubber composition, makes the prepared track wheel side rubber have better flame retardancy, wear resistance, aging resistance and tear resistance, is suitable for various harsh working environments, expands the application fields of track wheel side rubber, and promotes the development of related industries.

[0056] Further, the mixing comprises the following steps: A. Mix white carbon black and antimony trioxide and disperse them uniformly to obtain a suspension; then mix the suspension with natural rubber to obtain a first masterbatch.

[0057] B. Mix the other raw materials except the vulcanizer and the accelerator, and perform two-stage mixing to obtain the second masterbatch.

[0058] It should be noted that in step B, other raw materials are added to the composition except white carbon black, antimony trioxide, natural rubber, vulcanizing agent and accelerator.

[0059] C. Adding the first masterbatch to the second masterbatch and performing three-stage mixing and four-stage mixing to obtain a third masterbatch.

[0060] D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track wheel side rubber.

[0061] The above mixing process optimizes the traditional tire production process to reduce production costs and improve economic benefits. For example, the new vulcanization process can shorten the vulcanization time and improve production efficiency; the new mixing process can more evenly distribute the flame retardant and reinforcing filler to improve the flame retardant performance.

[0062] The one-stage mixing process is: mixing the suspension and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber.

[0063] Furthermore, the two-stage mixing includes mixing for 20-60 seconds, mixing with the plug lifted and pressed for 20-35 seconds, and then mixing with the plug lifted and pressed to 150-165° C. for debonding in this order.

[0064] The three-stage mixing includes mixing for 15-50s, mixing for 15-30s with the bolt lifted and the bolt pressed, and then mixing to 140-150°C for debonding with the bolt lifted and the bolt pressed.

[0065] The four-stage mixing includes mixing for 15-60 seconds, mixing with the plug lifted and the plug pressed for 20-40 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135-145° C. for debonding.

[0066] The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

[0067] Typically but not restrictively, the two-stage mixing includes mixing in a sequential order, wherein the mixing time may be 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s or 60s; the mixing time for lifting the bolt and pressing the bolt may be 20s, 22s, 24s, 26s, 28s, 30s, 32s, 34s ​​or 35s; then the mixing for lifting the bolt and pressing the bolt may be performed until the temperature reaches 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C, 160°C, 161°C, 162°C, 163°C, 164°C or 165°C before debinding.

[0068] Typically but not restrictively, the three-stage mixing includes mixing in a sequential order, wherein the mixing time may be 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s; the mixing time for lifting the bolt and pressing the bolt may be 15s, 18s, 21s, 24s, 27s, 30s; then the mixing is performed by lifting the bolt and pressing the bolt until the temperature reaches 140°C, 142°C, 144°C, 146°C, 148°C, 150°C before degumming.

[0069] Typically but not restrictively, the four-stage mixing includes mixing in a sequential order, wherein the mixing time may be 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s or 60s; the mixing time for lifting the bolt and pressing the bolt may be 20s, 25s, 30s, 35s, 40s; then the mixing is carried out by lifting the bolt and pressing the bolt until the temperature reaches 135°C, 137°C, 139°C, 141°C, 143°C, 145°C before degumming.

[0070] Typically but not restrictive, the five-stage mixing includes mixing in a sequential order, wherein the mixing time may be 10s, 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s; the mixing time for lifting the bolt and pressing the bolt may be 15s, 20s, 25s, 30s; then the mixing is carried out by lifting the bolt and pressing the bolt until the temperature reaches 95°C, 100°C, 105°C, 110°C, 115°C before degumming.

[0071] The third aspect of the present invention provides the use of the track wheel side rubber in the preparation of engineering tracks.

[0072] The application of the track wheel side rubber provided by the present invention provides better raw materials for preparing fire truck tires, hazardous chemical transport vehicle tires or coal mine underground transport vehicle tires. It releases less toxic gas during combustion, making it an ideal choice in modern society with increasing environmental awareness, and meets the modern tire industry's needs for high performance, high safety and environmental protection.

[0073] Preferably, the engineering tracks include tracks for fire trucks, tracks for transporting hazardous chemicals or tracks for agriculture.

[0074] In conjunction with the examples, some embodiments of the present invention are described in detail below. In the absence of conflict, the following examples and features in the examples can be combined with each other. The raw materials used in the examples and comparative examples of the present invention, if no specific conditions are specified, are carried out under normal conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0075] The silica used in the following examples and comparative examples is the deposited silica supplied by Quecheng Silicon Chemical Co., Ltd.; the accelerator DM is provided by LANXESS Chemical, and the accelerator CZ is provided by LANXESS Chemical.

[0076] Example 1 This embodiment provides a track wheel side rubber, which is obtained by mixing the following composition: 20 parts of natural rubber, 80 parts of chloroprene rubber, 40 parts of antimony trioxide, 26 parts of carbon black N234, 12 parts of white carbon black, 3 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0077] Example 2 This embodiment provides a track wheel side rubber, which is different from the embodiment 1 in that it contains 30 parts of natural rubber and 70 parts of chloroprene rubber, and the remaining raw materials and amounts are the same as those in the embodiment 1, which will not be repeated here.

[0078] Example 3 This embodiment provides a track wheel side rubber, which is different from the embodiment 1 in that antimony trioxide is 50 parts, carbon black N234 is 21 parts, and white carbon black is 10 parts. The remaining raw materials and amounts are the same as those in the embodiment 1 and will not be repeated here.

[0079] Example 4 This embodiment provides a track wheel side rubber. The difference from Embodiment 1 is that an equal weight of microcrystalline wax is used instead of chlorinated paraffin, 45 parts of antimony trioxide are used, and the remaining raw materials and amounts are the same as those in Embodiment 1, which will not be repeated here.

[0080] Example 5 This embodiment provides a track wheel side rubber, which is different from the embodiment 1 in that it contains 55 parts of natural rubber and 45 parts of chloroprene rubber. The remaining raw materials and methods are the same as those in the embodiment 1 and will not be described again.

[0081] Example 6 This embodiment provides a track wheel side rubber, which is different from the embodiment 1 in that 38 parts of antimony trioxide and 5 parts of chlorinated paraffin are used, and the remaining raw materials and amounts are the same as those in the embodiment 1, which will not be repeated here.

[0082] Example 7 This embodiment provides a track wheel side rubber, which is different from the embodiment 1 in that 35 parts of antimony trioxide and 8 parts of chlorinated paraffin are used, and the remaining raw materials and amounts are the same as those in the embodiment 1, which will not be repeated here.

[0083] Example 8 This embodiment provides a track wheel side rubber. The difference from the first embodiment is that the amount of zinc oxide used is 9 parts, and magnesium oxide is not used. The other raw materials and amounts are the same as those in the first embodiment, and will not be described again.

[0084] Example 9 This embodiment provides a track wheel side rubber. The difference from the first embodiment is that the amount of magnesium oxide used is 9 parts, zinc oxide is not used, and the remaining raw materials and amounts are the same as those in the first embodiment, which will not be described again.

[0085] Example 10 This embodiment provides a track wheel side rubber. The difference from the embodiment 1 is that the other accelerators are 3-3.3 parts, and the accelerator NA-22 is not used. The other raw materials and amounts are the same as those in the embodiment 1 and will not be described again.

[0086] Embodiment 11 This embodiment provides a track wheel side rubber, which is obtained by mixing a composition. The formula of the composition is exactly the same as that of Example 1, but the mixing method is different.

[0087] Comparative Example 1 This comparative example provides a track wheel side rubber, which is obtained by mixing the following composition: 20 parts of natural rubber, 80 parts of chloroprene rubber, 54 parts of carbon black N234, 12 parts of white carbon black, 3 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0088] Comparative Example 2 This comparative example provides a track wheel side rubber, which is different from Example 1 in that chloroprene rubber is not used, the amount of natural rubber used is 100 parts, and the remaining raw materials and amounts are the same as those in Example 1, which will not be repeated here.

[0089] Comparative Example 3 This comparative example provides a track wheel side rubber, which is different from Example 1 in that carbon black N234 is 20 parts and white carbon black is 24 parts, and the remaining raw materials and amounts are the same as those in Example 1, which will not be repeated here.

[0090] Comparative Example 4 This comparative example provides a track wheel side rubber, which is different from Example 1 in that carbon black N234 is 43 parts and white carbon black is 5 parts, and the remaining raw materials and amounts are the same as those in Example 1, which will not be repeated here.

[0091] Preparation Example 1 The preparation methods of Examples 1-10 and Comparative Examples 2-4 are as follows: 1. First, place white carbon black and antimony trioxide in a stirring kettle and stir them evenly to prepare antimony trioxide white carbon black pre-dispersed suspension, and then mix the suspension with natural rubber to prepare the first masterbatch, which is reserved for later use.

[0092] The specific process of the first stage mixing is: add antimony trioxide and white carbon black pre-dispersed suspension and half of the natural rubber into the internal mixer, control the speed at 40-55rpm, mix for 20-60s, lift the plug and add the remaining natural rubber, press the plug and mix for 20-50s, mix to 150-165℃, and discharge the rubber.

[0093] 2. The remaining raw materials, except the vulcanizer and the accelerator, are mixed in two stages to prepare the second masterbatch.

[0094] The specific process of the two-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 20~60s, the plug is lifted and pressed for mixing for 20~35s, and then the plug is lifted and pressed for mixing to 150~165℃ and the glue discharge is carried out at 40~55 rpm.

[0095] 3. The first masterbatch prepared in step 1 is added to the second masterbatch, and the mixture is mixed in three stages and four stages to obtain the third masterbatch.

[0096] The specific process of the three-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 15~50s, the plug is lifted and pressed to mix for 15~30s, and then the plug is lifted and pressed to mix until the temperature reaches 140~150℃ for degumming.

[0097] The specific process of the four-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 15~60s, mixing with the plug lifted and the plug pressed for 20~40s, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135~145℃ for degumming.

[0098] 4. Add vulcanizing agent and accelerator to the third masterbatch and mix them in five stages to obtain the track wheel side rubber.

[0099] The specific process of the five-stage mixing is: the rotation speed is controlled at 20-35 rpm, mixing is carried out in sequence for 10-50 s, the plug lifting and pressing mixing is carried out for 15-30 s, and then the plug lifting and pressing mixing is carried out to 95-115°C for degumming.

[0100] Preparation Example 2 The preparation methods of Example 11 and Comparative Example 1 are as follows: 1. One-stage mixing: The raw materials other than the vulcanizing agent and the accelerator are mixed in one stage. The specific process of the one-stage mixing is that the rotation speed is controlled at 40-55 rpm, and the mixing is carried out in sequence for 30-70 seconds, the plug is lifted and pressed, and the mixing is carried out for 20-35 seconds, and then the plug is lifted and pressed, and the mixing is carried out to 150-165°C and the rubber discharge is 40-55 rpm to obtain a mixed rubber.

[0101] 2. Second stage mixing: the rotation speed is controlled at 40-55 rpm, the first stage mixed rubber is mixed in sequence for 15-50 s, the plug is lifted and pressed for mixing for 15-30 s, and then the plug is lifted and pressed for mixing until the temperature is 140-150 ℃ for rubber discharge to obtain the second stage mixed rubber.

[0102] 3. Vulcanization stage: Add vulcanizing agent and accelerator to the above two-stage mixed rubber, control the speed at 20-35rpm, mix for 10-50s, remove the plug and mix for 15-30s, then remove the plug and mix until the temperature is 95-115℃ to discharge the rubber, and obtain the final mixed rubber.

[0103] Test Example 1 The track wheel side rubbers obtained in the embodiments and comparative examples were subjected to performance tests.

[0104] Including: 300% elongation stress M300 is carried out in accordance with the provisions of GB / T528-1998; tensile strength TB is carried out in accordance with the provisions of GB / T528-1998; elongation at break EB% is carried out in accordance with the provisions of GB / T528-1998. Hardness is carried out in accordance with the provisions of GB / T531.1-2008.

[0105] The flame retardant performance was tested by Qingdao Sinochem New Materials Laboratory, a third-party testing agency, and the testing method was carried out in accordance with the provisions of MT / T113-1995.

[0106] The obtained data are shown in Tables 1 and 2 below.

[0107] Table 1

[0108] Table 2

[0109] It can be seen from the embodiment and the comparative example that the physical properties and flame retardant properties of the embodiment have a good balance, ensuring both flame retardant properties and physical properties, while the physical properties of the comparative example are similar to those of the embodiment, but its flame retardant properties are poor. Compared with the prior art, the present invention has obvious and positive progress. The tire prepared by the present invention has the characteristics of high performance and high flame retardancy, which greatly improves the service life of the tire.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A track wheel side rubber composition, characterized in that: In parts by weight, the composition comprises: 15-55 parts of natural rubber, 45-85 parts of chloroprene rubber, 12-32 parts of carbon black, 7-16 parts of white carbon black, 30-65 parts of flame retardant, 5-10 parts of activator, 0.5-1.5 parts of activation aid, 1-3 parts of antioxidant, 1-4 parts of vulcanizing agent and 2.5-4.5 parts of accelerator; The flame retardant includes antimony trioxide.

2. The track wheel side rubber composition according to claim 1, characterized in that: The flame retardant further comprises tricresyl phosphate and / or chlorinated paraffin.

3. The track wheel side rubber composition according to claim 1, characterized in that: The activator comprises magnesium oxide and / or zinc oxide; The activating aid includes stearic acid.

4. The track wheel side rubber composition according to claim 1, characterized in that: The brand of the antioxidant includes at least one of antioxidant 4020, antioxidant RD and antioxidant 4010NA; The vulcanizing agent includes sulfur; The brand of the accelerator includes at least one of NA-22, DM and CZ.

5. The track wheel side rubber composition according to any one of claims 1 to 4, characterized in that: The grade of the carbon black includes at least one of N220, N234, N330, N326 and N375; The white carbon black includes vapor deposition white carbon black and precipitation white carbon black.

6. The track wheel side rubber composition according to any one of claims 1 to 4, characterized in that: In parts by weight, the composition comprises: 15-55 parts of natural rubber, 45-85 parts of chloroprene rubber, 12-32 parts of carbon black, 7-16 parts of white carbon black, 30-60 parts of antimony trioxide, 2-5 parts of chlorinated paraffin, 2-4 parts of magnesium oxide, 3-6 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur and 2.5-4.5 parts of accelerator.

7. A track wheel side rubber, characterized in that: The invention is mainly obtained by mixing the track wheel side rubber composition according to any one of claims 1 to 6.

8. The track wheel side rubber according to claim 7, characterized in that: The mixing comprises the following steps: A. mixing white carbon black and antimony trioxide and dispersing them uniformly to obtain a suspension; then mixing the suspension with natural rubber to obtain a first masterbatch; B. Mixing other raw materials except the vulcanizing agent and the accelerator, and performing two-stage mixing to obtain a second masterbatch; C. adding the first masterbatch to the second masterbatch and mixing them in three stages and four stages to obtain a third masterbatch; D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track wheel side rubber.

9. The track wheel side rubber according to claim 8, characterized in that: The mixing process of the first stage is: mixing the suspended matter and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber; The two-stage mixing includes mixing for 20-60 seconds, mixing for 20-35 seconds with the bolt lifted and the bolt pressed, and then mixing to 150-165° C. for debonding with the bolt lifted and the bolt pressed; The three-stage mixing includes mixing for 15-50 seconds, mixing for 15-30 seconds with the bolt lifted and the bolt pressed, and then mixing to 140-150° C. for debonding with the bolt lifted and the bolt pressed; The four-stage mixing includes mixing for 15-60 seconds, mixing for 20-40 seconds with the bolt lifted and the bolt pressed, and then mixing until the temperature reaches 135-145° C. for debonding. The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

10. Use of the track wheel side rubber according to any one of claims 7 to 9 in preparing engineering tracks.

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